CVE-2021-31337 Missing authorization in SINAMICS Medium Voltage Products
Remote attackers can access SIMATIC HMI devices without authentication if the Telnet service is enabled, requiring configuration changes to mitigate.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-31337?
CVE-2021-31337 is a critical missing authorization vulnerability in SINAMICS Medium Voltage Products, published on 28 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Telnet service of the SIMATIC HMI Comfort Panels system component in affected products does not require authentication, which may allow a remote attacker to gain access to the device if the service is enabled. Telnet is disabled by default on the SINAMICS Medium Voltage Products (SINAMICS SL150: All versions, SINAMICS SM150: All versions, SINAMICS SM150i: All versions).
Weakness: CWE-306
Which versions are affected by CVE-2021-31337?
It affects 3 products.
Products include Siemens Sinamics Sl150 Firmware, Siemens Sinamics Sm150 Firmware, Siemens Sinamics Sm150i Firmware.
How do I fix CVE-2021-31337?
No fix has been published for CVE-2021-31337 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2021-31337 being exploited?
There is no known exploitation of CVE-2021-31337 in the wild and no public exploit code.
Other vulnerabilities in SINAMICS Medium Voltage Products
Sources
Also known as GHSA-hwxw-fmr7-f2c3.